1.

The diameter of a circle is a line which joins two points on the circle and also passes through the centre of the circle. If AB isa diameter of the circle; C is its centre. Expressing thediameter of the circle (d) in terms of itsradius (r) we getd=r/2d=r/4d=2rOOnone of these​

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D = 2R HOPE it's HELP you



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